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UPSC Civil Service Exam Questions - Engineering

Q1:

A clay layer 3 m deep is sandwiched by a pervious material. The soil reaches 90% consolidation in 3 years. At another site, the same clay layer is bounded by impervious boundary at the bottom and sand at the top. What is the time taken by this layer to reach 90% settlement ?

A 9 years

B 12 years

C 15 years

D 21 years

ANS:B - 12 years

t= 3 years * (3m/1.5m)^2 = 12 year note we chose 1.5 m because we have drainage up and down for sn layer.